198088 ⎘
Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation , reproducing using an optical beam at lower power ; Record carriers therefor; Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following specially adapted for discs, e.g. for compensation of eccentricity or wobble
Sub-classes:Optical information processing device
#2Quadrature track error signal for optical recording media and devices
#3Information recording and playback device
#4Quadrature track error signal for optical recording media and devices
#5OPTICAL PICKUP AND OPTICAL DISC DEVICE
#6Methods, systems, and computer program products for correcting repeatable runout
#7INTEGRATED CIRCUIT AND OPTICAL DISC APPARATUS
#8Optical disc recording device
#9Optical information recording medium, information recording method and information recording system
#10OPTICAL INFORMATION RECORDING/REPRODUCING APPARATUS, OPTICAL INFORMATION REPRODUCING APPARATUS, AND OPTICAL INFORMATION RECORDING/REPRODUCING METHOD
#11Cyclic memory and disc device
#12Device for layer-jumping control of optical disc devices and related method
#13Diffraction grating and optical pickup device
#14Optical disc apparatus and information recording and reproducing method
#15Extended focus control
#16Optical disk apparatus and method of adjusting the same
#17Optical disc recording device
#18Focus control for optical scanner
#19Disc drive apparatus
#20Tracking system with dual differential signals with fraction of A/C signal added back to D/C signal
#21Optical pickup apparatus, optical disk apparatus and optical pickup adjustment method